Thread: Help ID this 538181 Block
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Old 06-30-2022, 05:12 PM
421mike 421mike is offline
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Default block numbers
I bought a 63 421 short block over the Pontiac parts counter years ago to use as a basis for a SD engine. I have that engine in my shop and it does not, nor has it ever had any numbers stamped on it. FWIW. Mike

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